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J/ApJ/508/491       M101 Cepheids                            (Stetson+, 1998)

The extragalactic distance scale key project. XVI. Cepheid variables in an inner field of M101. Stetson P.B., Saha A., Ferrarese L., Rawson D.M., Ford H.C., Freedman W.L., Gibson B.K., Graham J.A., Harding P., Han M., Hill R.J., Hoessel J.G., Huchra J.P., Hughes S.M.G., Illingworth G.D., Kelson D.D., Kennicutt R.C.Jr, Madore B.F., Mould J.R., Phelps R.L., Sakai S., Silbermann N.A., Turner A. <Astrophys. J. 508, 491 (1998)> =1998ApJ...508..491S
ADC_Keywords: Stars, variable ; Photometry Mission_Name: HST Keywords: Cepheids - galaxies: distances and redshift - galaxies: individual (M101) - galaxies: photometry Abstract: We report on the identification of 255 candidate variable stars in a field located some 1.7' from the center of the late-type spiral galaxy M101 = NGC 5457, based on observations made with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope. Photometric measurements in the F555W and F814W filters - analyzed independently with the DAOPHOT/ALLFRAME and DoPHOT software suites - have been transformed to the Johnson V and Kron-Cousins I standard magnitude systems. Periods and intensity-averaged mean magnitudes for 61 carefully selected candidate Cepheid variables with periods in the range 10-48 days indicate a reddening-corrected mean distance modulus (m-M)0=29.05±0.14 (if the true modulus of the Large Magellanic Cloud is 18.50±0.10, and if there is no dependence of the period-luminosity relation on metal abundance); results consistent with this are obtained whether or not the sample is expanded to include a larger fraction of the candidates. Applying a metallicity-dependent correction of +0.16±0.10mag would increase this estimate to (m-M)0= 29.21±0.17mag. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 70 139 Coordinates and mean magnitudes for local standards table3.dat 76 255 Variable coordinates, periods, and mean magnitudes table5.dat 48 93 Comparison of ALLFRAME AND DoPHOT for variables
See also: J/ApJ/463/26 : Extragalactic Distance Scale Key Project. III (Kelson+ 1996) J/ApJ/507/655 : VI photometry of new Cepheids in NGC 2541 (Ferrarese+, 1998) J/ApJ/521/155 : New Cepheids and distance to NGC 4535 (Macri+, 1999) J/ApJ/523/540 : VI photometry of new Cepheids in NGC 3319 (Sakai+, 1999) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1 I1 --- Chip [0/4] WFPC2 chip number 3- 7 I5 --- [SSF98] Identification number ([SSF98] NNNNN in Simbad) 9- 13 F5.1 pix Xpos X position 15- 19 F5.1 pix Ypos Y position 21- 22 I2 h RAh Right ascension (J2000) 24- 25 I2 min RAm Right ascension (J2000) 27- 31 F5.2 s RAs Right ascension (J2000) 33 A1 --- DE- Declination sign (J2000) 34- 35 I2 deg DEd Declination (J2000) 37- 38 I2 arcmin DEm Declination (J2000) 40- 43 F4.1 arcsec DEs Declination (J2000) 45- 49 F5.2 mag Vmag V magnitude (F555W) 51- 54 F4.2 mag e_Vmag rms uncertainty on V magnitude 56- 60 F5.2 mag Imag I magnitude (F814W) 62- 65 F4.2 mag e_Imag rms uncertainty on I magnitude 67- 68 I2 --- o_Vmag Number of observations in Vmag 70 I1 --- o_Imag Number of observations in Imag
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [SSF98] Identification number ([SSF98] VNNN in Simbad) 5 I1 --- Chip [1/4] WFPC2 chip number 7- 11 F5.1 pix Xpos X position 13- 17 F5.1 pix Ypos Y position 19- 20 I2 h RAh Right ascension (J2000) 22- 23 I2 min RAm Right ascension (J2000) 25- 29 F5.2 s RAs Right ascension (J2000) 31 A1 --- DE- Declination sign (J2000) 32- 33 I2 deg DEd Declination (J2000) 35- 36 I2 arcmin DEm Declination (J2000) 38- 41 F4.1 arcsec DEs Declination (J2000) 43- 48 F6.2 d Per Period 50- 54 F5.2 d e_Per rms uncertainty on Per 56- 60 F5.2 mag <Vmag> Mean V magnitude (F555W) 62- 65 F4.2 mag e_<Vmag> rms uncertainty on <Vmag> 67- 71 F5.2 mag <Imag> Mean I magnitude (I814W) 73- 76 F4.2 mag e_<Imag> rms uncertainty on <Imag>
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 3 I3 --- [SSF98] Identification number ([SSF98] VNNN in Simbad) 5- 8 F4.1 d Per DoPHOT period 10- 14 F5.2 mag <Vmag> Mean DoPHOT V magnitude (F555W) 16- 20 F5.2 mag <Imag> Mean DoPHOT V magnitude (I814W) 22- 26 F5.2 [d] DlogPer DoPHOT-ALLFRAME log(Per) 28- 32 F5.2 mag D<Vmag> DoPHOT-ALLFRAME <Vmag> 34- 37 F4.2 mag e_D<Vmag> rms uncertainty on D<Vmag> 39- 43 F5.2 mag D<Imag> DoPHOT-ALLFRAME <Imag> 45- 48 F4.2 mag e_D<Imag> rms uncertainty on D<Imag>
History: From ApJ electronic version References: Freedman et al. Paper I 1994ApJ...427..628F Hughes et al. Paper II 1994ApJ...428..143H Kelson et al. Paper III 1996ApJ...463...26K, Cat. J/ApJ/463/26 Ferrarese et al. Paper IV 1996ApJ...464..568F Hill et al. Paper V 1998ApJ...496..648H Silbermann et al. Paper VI 1996ApJ...470....1S Graham et al. Paper VII 1997ApJ...477..535G Rawson et al. Paper VIII 1997ApJ...490..517R Phelps et al. Paper IX 1998ApJ...500..763P Hughes et al. Paper X 1998ApJ...501...32H Turner et al. Paper XI 1998ApJ...505..207T Ferrarese et al. Paper XII 1998ApJ...507..655F, Cat. J/ApJ/507/655 Kennicutt et al. Paper XIII 1998ApJ...498..181K Silbermann et al. Paper XIV 1999ApJ...515....1S Madore et al. Paper XV 1999ApJ...515...29M Gibson et al. Paper XVII 1999ApJ...512...48G Macri et al., Paper XVIII 1999ApJ...521..155M, Cat. J/ApJ/521/155 Kelson et al. Paper XIX 1999ApJ...514..614K Graham et al. Paper XX 1999ApJ...516..626G Mould et al., Paper XXI 2000ApJ...528..655M Prosser et al., Paper XXII 1999ApJ...525...80P Sakai et al., Paper XXIII 1999ApJ...523..540S, Cat. J/ApJ/523/540 Sakai et al. Paper XXIV 2000ApJ...529..698S Gibson et al. Paper XXV 2000ApJ...529..723G Ferrarese et al. Paper XXVI 2000ApJ...529..745F Kelson et al. Paper XXVII 2000ApJ...529..768K Mould et al. Paper XXVIII 2000ApJ...529..786M
(End) Patricia Bauer [CDS] 20-Apr-1999
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